Latest threads in Hobby Electronics Basicsshow only best voted threads

Subject Author Posted Replies
 
Recap On Absolute Cheapest Dummy Load
Eventually road 15 km against the wind in highest assist. The motor and refurbished battery were both uniformly warm. There were no hot spots on the battery in the one minute dummy load test so this...
 
Absolute Cheapest Load To Test A Rebuilt Battery
Need to draw 18 Amps from a 36 v battery. For 5 minutes. 2 lugs in a brine solution? Drive rebar into the ground? Well, that's 2 Ohms, 648 Watt. Brine works, although you must measure the Amps and...
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Hear sounds from TV to my radio
I want to hear sound from my Tv using my standalone radio. All the TV output HDMIs are being used. My inputs on my radio for TV/Dbs are coaxial. What parts do I need? Thanks. . Look up "F connector"
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OT - Standby electrics - worth consideration?
I just worked out that in my (UK) house (with my children long gone!). The electric standby items are going to cost £452 UKP per year at October 2022 going forward cap levels, and of course more...
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Detect the turbidity
Hello good day! I need a simple circuit to detect the turbidity of the reuse water from the washing machine, that is, discard the 1st water and reuse the others, a very simple circuit for a low-income...
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Replacement for Li-Ion battery
I want to replace this 3.7 Volt Lithium Ion battery. The dimensions are 1 14/16 x 8/16 inch. Can some help me find a replacement? Thanks, Andy Thanks for your help. The battery was a 14500. I ordered...
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(accidentally) shorted a mosfet's drain and source
For a project I noticed my Arduino PWM pump controller (basically just an Arduino, MOSFET, and protection diode) was behaving oddly, so I powered the pump directly from the 12V power supply, turning...
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Controlling alot of LEDs from Arduino or AVR. Maybe 74HC595
I am trying to create a project much like like a Marquee sign, I want to be able to control hundreds of LEDs from a set of chips. From my research I found the 74HC595 chip and using a bunch of these...
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Why A DC to DC Converter Will Not Increase Range of the $3 Voltmeter Either
Guessing that there was no clever end run around the 30v maximum I tried a DC to DC converter set to 15v then measured the voltage between the +38v and the +15v. Instead of 23 v it jumped around all...
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Why the $3 Voltmeter Cannot Work With Inline Resistance
The lowest voltage it can measure is what powers the LED display so something must be acting like a DC to DC converter set at the display voltage. Additional resistance in series lowers the current...
 
Cheap Voltmeter Doesnt Fry Over Voltage
It simply loses linearity. At least up to 38 v where it reads 36 v. Who cares?
 
Jus Run the Voltage Backwars Thru a 8 v Battery
The Fieri light runs on 4 rechargeable cells 2p X 2s. Just wire it so that the voltmeter always gets 8 volts less than the ebike battery. Another idea is to just come off one of the parallel 4 cells...
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220k Resistor Does Not Werk On 100 K Voltmeter
Hit just flashes. Furst guess is not enuff nano amps gits thru that yuge resistor. I ben very luky in that California no longer picks up toxik elektrikal stuff. But all I got is 2 resistors wif leads,...
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Converting a $3 / 30v Voltmeter to A 45 v Voltmeter.
The impedance is 100k Ω. Put a 50 kΩ resister in series with the voltmeter and map out the correction. I never would have thought of that. You should get a Nobel prize! Not as easy as it sounds if...
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Free Energy or Energy Storage
Hi Dears, I watched this video and I'm very curious if this is a really storage or fake. I know that free Energy don't exist but this energy storage is real? Video Youtube